Jurors have convicted an 18-year-old gang member of second-degree murder for the fatal stabbing of a Redwood City man during a fight in front of an apartment complex in August 2008.Adrian Sedano was convicted Friday in San Mateo County Superior Court for the Aug. 9, 2008, fatal stabbing of 23-year-old Ramon Buenrostro in Redwood City, Chief Deputy District Attorney Steve Wagstaffe said.The special allegation that he used a knife in the murder was found true as well. Sedano, who was a juvenile at the time of the killing but was tried as an adult, had also pleaded no contest on May 5 to committing a felony as a gang member. He faces 19 years to life in prison when he is sentenced July 23.Sedano stabbed Buenrostro during a fight between two groups of people in front of an apartment complex at 551 Geneva Ave. in Redwood City, Wagstaffe said.Another teen, Christian Lopez, had also initially been charged with murder for hitting Buenrostro with a metal object during the fight, Wagstaffe said.Lopez pleaded no contest on April 7, 2009, to felony assault with a deadly weapon. He is also scheduled to be sentenced July 23.